Specific reasons for censoring AI generated posts may vary depending on the specific forum and its rules and policies. For example, someone can argue that such posts are spammy, zero or low value, misleading, etc... Btw, it's important to note that AI-generated content is not universally accepted on the Internet. In fact, sites like Reddit have specific rules in place to prohibit the use of such content.
My point is that that post is no worse than many of the ones we see out there in terms of low value or spammy, and that the fact that it is written by an AI should not be enough to delete it, considering that there is nothing about it in the unofficcial rules and even more thinking that the OP has made it clear that it is written by an AI.
Ah yes, I suppose I'm just a relic of the past. But I still believe that an internet forum should be a place where humans come together to discuss and share their thoughts, not a robot convention where mindless machines spout pre-programmed responses. Real discussions require actual thought and consideration, something that robots just don't have the capacity for.
I don't think we need any specific rules about what constitutes an "Internet forum," because it's one of the most basic definitions of that term:
An Internet forum, or message board, is an online discussion site where people can hold conversations in the form of posted messages.